In the last scene of A Patch Of Fog we can see a present from Robert to Sandy Duffy. Is there any indication or hint given to what is in that present? I believe it could be the manuscript or the security cam footage but these are just wild guesses.

The tag on the present has the following text:

TO SANDY

FROM ROBERT

MERRY XMAS

DEATH TO ELEPHANTS

Here is a screenshot from the scene: